frightening (n.)
frightening (adj.)
- alarming
- appalling
- awing
- bullying
- chilling
- daunting
- deterrent
- dire
- disconcerting
- discouraging
- disheartening
- dismaying
- disquieting
- distressing
- dreadful
- fearful
- fearsome
- formidable
- frightful
- hair-raising
- harrowing
- horrifying
- intimidating
- petrifying
- scary
- shocking
- spooky
- startling
- terrifying
